watch the unit 4 part 1 lecture video and answer the following question: which of the following best describes what fire is? question 1 options: a. a mechanical reaction b. a chemical reaction c. a fission reaction d. a fusion reaction

Answer:

all

of them

Explanation:

Answer:

Explanation:

2H2O = H2 + O2

this ain't balanced because the value of hydrogen are not the same.

Answer:

Fibre optic technology.

Explanation:

Fibre optic technology, as the name implies, uses light pulses to transmit data via strands of glass or plastic. It's the preferred technology for the government's National Broadband Network (NBN), which offers 100Mbps+ download speeds.

Explanation:

ok so I believe:

a. increase in atomic radii going down a group and decrease going across a period.

b. increase in IE1 going across a period and up a group. the highest IE1 elements are like He, Ne, F and first ionization energy decreases moving further away from those elements moving south west on the periodic table.

c. electron affinity increases moving across a period left to right.

d. ionic radii increases going down a group and decreases going across a period left to right

e. electronegativity increases across a period but decreases down a group. (opposite for electropositivity)

what is meant by the d-block elements? are you referring to the spdf location?

Answer:

A and D.

Explanation:

A shows that people continued to use more and more fossil fuels until around the middle of the time period where the cost of certain fossil fuels doubled. This helps show that less people were willing to pay this price and would start looking for other means of fuel. This leeads to D.

As people looked for other fuel sources renewable energy uses reached a high in 2012 which was after the cost of certain fuels had doubled.

Answer:

They are sour. =)

Explanation:

Answer: I got 15.56

Explanation: I am so sorry if that's wrong but I used the equation Q=m×c×ΔT where

m=mass

ΔT= temp change that occurs

c= specific heat capacity

good luck, again sorry if i totally biffed that

Hi! I am here to help so the answer is ,Utilizes a nucleus to contain its DNA!

The volume of water added to dissolve potassium hydrogen phthalate (KHP) does not matter because the mass of KHP used is known and it will dissolve completely in any volume of water.

In volumetric analysis, the primary objective is to find the exact concentration of an analyte in a given solution. Analyte refers to the substance whose concentration is to be determined.In order to measure the analyte concentration, the known volume of the titrant of known concentration is added to the analyte until the endpoint is reached.Endpoint refers to the point in a titration where the reaction between the analyte and titrant is complete. The endpoint can be detected by observing a physical change in the system.In the case of KHP, it dissolves completely in any volume of water.

Therefore, the mass of KHP used can be accurately measured and dissolved in any volume of water. As a result, the volume of water added to dissolve the KHP does not affect the accuracy of the experiment.In summary, the volume of water added to dissolve KHP does not matter because the mass of KHP used is known and it will dissolve completely in any volume of water.

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143 J of heat is needed to change the temperature of the gas from 2250 K to 2300 K.

The specific heat capacity of hydrogen gas is 14.3 J/g.K.

To solve for the amount of heat needed, the formula that we can use is:

Q = mcΔT

where:

Q = heat (in joules)

m = mass (in grams)

c = specific heat capacity (in J/g.K)

ΔT = change in temperature (in K)

A) We are given:

m = 0.20 g

c = 14.3 J/g.K

ΔT = 100 K - 50 K = 50 K

Substituting the given values to the formula:

Q = mc

ΔTQ = (0.20 g) (14.3 J/g.K) (50 K)

Q = 143 J

Therefore, 143 J of heat is needed to change the temperature of the gas from 50 K to 100 K.

B) We are given:

m = 0.20 gc = 14.3 J/g.KΔT = 300 K - 250 K = 50 K

Substituting the given values to the formula:

Q = mcΔT

Q = (0.20 g) (14.3 J/g.K) (50 K)

Q = 143 J

Therefore, 143 J of heat is needed to change the temperature of the gas from 250 K to 300 K.

C) We are given:

m = 0.20 gc = 14.3 J/g.K

ΔT = 2300 K - 2250

K = 50 K

Substituting the given values to the formula:

Q = mcΔTQ

= (0.20 g) (14.3 J/g.K) (50 K)Q

= 143 J

Therefore, 143 J of heat is needed to change the temperature of the gas from 2250 K to 2300 K.

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The statement oxygen is negative and hydrogen is positive is true.

Charge on an element is determined by the position of an element in the periodic table.More precisely,it is determined by an element's electronic configuration.

Elements having one electron in their outermost or valence shell are  situated to the left of the periodic table and are positive as they  loose their one electron present in valence shell to form cations that are positively charged ions.

Elements having six or seven electrons in their valence shell tend to gain one or two electrons respectively to complete their octet.These elements form anions that are negatively charged ions.

Hydrogen with atomic number 1 has 1 electron in it's valence shell which it looses to acquire a positive charge and hence form a cation .

Oxygen on the other hand,with atomic number 8 has 6 electrons in it's valence shell and thus gains 2 more electrons to complete the octet,and hence gain a negative charge and form an anion.

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The compound that contains a multiple covalent bond in the list is C2H4.

A multiple covalent bond is a double or triple bond. The bonds are known by multiple dashes between atoms that are covalently bonded.

Compounds that contain multiple covalent bonds do not contain the full compliment of hydrogen atoms per carbon atom. Hence, the compound that contains a multiple covalent bond is C2H4.

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A because according to electron sea theory magnesium shares two valence electrons in electron sea while sodium shares one suggesting that magnesium has stronger metallic bond than sodium so breaking metallic bond in magnesium will require more energy as compared to breaking metallic bond in sodium

The melting point of magnesium is higher than the melting point of sodium because it contributes two additional electrons per atom than sodium in the electron sea. Thus option d is correct.

Melting point of a substance is the temperature at which it converts from solid state to liquid state where, the two phases are in equilibrium. Melting point is affected by the bond type, molecular weight, temperature and pressure.

Melting point of elements increases along a period because the atomic size is decreasing along the period and molecular weight is increasing. Thus, the nuclear attractive pull increases resulting in higher energy needed to break the attractive force.

Magnesium is 12th element and sodium is 11th element. Thus magnesium is smaller than sodium and have one more electron than sodium. Thus magnesium have high molecular weight and high nuclear attraction leads to its higher melting point.

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Answer:

ionic bond, also called electrovalent bond, type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound. Such a bond forms when the valence (outermost) electrons of one atom are transferred permanently to another atom.

Explanation:

Molality of sulfuric acid is 1.1.

As we know that density of solution = 1.509 = mass of solution \ Volume.

10% of \(H{_2}SO_4\) by mass,

\(\frac{10}{100} \times 1.509\) v (g)

As the mass of solvent \(=\frac{90}{100}\times 1.509 V(g)\)

98 g of \(H{_2}SO_4\) contains moles = 1,

\(\frac{10 \times 1.509 V g}{100}\) of \(H{_2}SO_4\) contains moles = \(\frac{1.509 .v}{10 \times 98}\) moles

Molality = moles of solute/ Mass of solvent (kg)

             =\(\frac{1.509 \times 100 \times 1000}{10 \times 98 \times 1.509 .V (kg)}\)

             = 1.1

Hence, the Molality of sulphuric acid is 1.1.

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It is necessary for nations to research and plan for alternative forms of energy because the supply of fossil fuels will someday be exhausted (Option B).

The supply of fossil fuels is limited because this type of fuel is based on a finite amounts of prime matter, i.e. the presence of decomposed dead animals and plants that form fossil fuels such as coal.

Therefore, with this data, we can see that the supply of fossil fuels is limited and therefore we need to develop others renewables sources of energy.

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Diatomaceous earth filters c. Can be used for a public water treatment system.

Diatomaceous earth filters are effective in removing particles and impurities from water. While they can be used as part of a public water treatment system, they may be combined with other methods, such as a chlorination system for disinfection or a sand filtration system for further filtration. However, diatomaceous earth filters are not typically used in public sewer treatment systems.

Diatomaceous earth filters are not typically used in public sewer treatment systems as they are designed to remove particles from water, and not sewage. In sewer treatment systems, other types of filtration and treatment methods are typically used, such as activated sludge processes, sedimentation tanks, and anaerobic digestion systems.

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The equation of the combustion reaction is; C3H7OH(l)+92O2(g)→3CO2(g)+4H2O(g) .

The term combustion has to do with the process by which a substance can be burnt in oxygen. We have to note that the reaction is an oxidation reaction as there is an increase in the oxidation number of the carbon in the isopropanol.

Now, the process of the oxidation of the isopropanol would give rise to the formation of carbon dioxide, water, and heat . The equation of the reaction is seen to be; C3H7OH(l)+92O2(g)→3CO2(g)+4H2O(g) .

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Answer:

The correct answer is from areas of high concentration to low concentration.

Explanation:

A concentration gradient exists for these molecules, so they have the potential to diffuse into (or out of) the cell by moving down it.

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True. The element in period 3 that can be used in making computer chips is silicon. because it is a metalloid.

Metalloids have the have properties intermediate of metals and nonmetals. metals give electrons while nonmetals receive. metalloids do neither and rather decides to share. Metals conduct electricity  nonmetals don't while metalloids conduct electricity sparsely. Metals form basic oxides, non metals acidic oxides while metalloids amphoteric or slightly acidic oxides. Metalloids also display typical nonmetal properties like brittleness. Metalloids can also form alloys. The metalloids silicon (Si) is the elements found along the step like line between metals and non-metals of the periodic table and used in making computer chips. It consist of properties from both metals and non-metals.

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Answer:

Endothermic is identified if the process requires heat as a reactant, since endothermic means "intake of heat", so it has to take in some type of heat.

Answer:

312140 LB/CU FT

Explanation:

MULTIPLY

Using the formula M1V1 = M2V2, the molarity of M1 = 5M, V1 = 30mL M2 = x V2 = 300mL is 0.5M. Option B is the correct answer.

To solve for the unknown in the given problem, we need to use the formula M1V1 = M2V2. This formula states that the amount of solute (Molarity) in a solution is constant, as long as the volume of the solution is constant.

We are given M1 = 5M and V1 = 30mL, and we need to find M2, given V2 = 300mL. Substituting these values into the formula, we get:

5M × 30mL = M2 × 300mL

Simplifying this equation, we get:

150 = 300M2

Dividing both sides by 300, we get:

M2 = 0.5M

Therefore, the answer is B. 0.5M, which represents the molarity of the unknown solution. In summary, we used the formula M1V1 = M2V2 and substituted the given values to find the unknown molarity, which was the solution to the problem.

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Answer:

Im pretty sure they bahave differently because The particles in a suspension may be separated by filtration unlike those in a colloid. Colloids are able to scatter light, but suspensions cannot transmit light. Particles in a suspension

Explanation:

Answer: The particles in a suspension may be separated by filtration unlike those in a colloid. Colloids are able to scatter light, but suspensions cannot transmit light. Particles in a suspension can be seen by the naked eye, but those in a …

Explanation:

Neutralization reactions involve the reaction of an acid and a base to form a salt and water. These reactions typically result in a change in pH from acidic to neutral or basic. If the starting solution is acidic, the addition of a base will increase the pH and cause the solution to become more basic. If the starting solution is basic, the addition of acid will decrease the pH and cause the solution to become more acidic.

The BTB (bromothymol blue) indicator is a pH indicator that changes color from yellow (acidic) to blue (basic) in the presence of a base. It is commonly used to indicate the endpoint of a titration, where a solution of known concentration is added to a solution of unknown concentration until the reaction is complete.

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Answer:

Arcuate: A fan-shaped delta, bowed or curved.

Cuspate: V-shaped delta.

Bird-foot: Outstretched claws delta

Inverted: The narrow end of delta, or river delta.

Waves: Large or regular shaped waves delta.

Tires: Round shaped delta

River estuary: A landform deposited by sediment

Explanation:

The following equation in terms of relative numbers of representative particles, number of moles, and masses of atoms and products is

78.2g K + 36.0 g \(H_2O\) \(\rightarrow\)  112.2 g KOH + 2.0 g \(H_2\).

The atom is the smallest piece of stuff that can be divided without producing charged particles. Additionally, it is the tiniest material with characteristics similar to chemical elements. As a result, the atom serves as the fundamental component of chemistry. Examine different electron arrangements in the electron shells that protect an atom's atomic nucleus. An atom is primarily made of space. The rest is made up of a positively charged nucleus made up of protons and neutrons that is surrounded by a cloud of negatively charged electrons. The nucleus is small and dense in comparison to electrons, which are the lightest charged particles in nature. Electrons are pulled to any positive charge due to the electric forces that bind them to the nucleus of atoms.

\(2 \times6.02 \times 10^{23}\) atoms K + \(6.02 \times 10^{23}\) atoms \(H_2O\) \(\rightarrow\) \(2 \times 6.02 \times 10^{23}\) atoms KOH + \(6.02 \times 10^{23}\) atoms \(H_2\)

2 mol K + 2 mol \(H_2\) \(\rightarrow\) 2 mole KOH + 1 mol \(H_2\)

78.2g K + 36.0 g \(H_2O\) \(\rightarrow\)  112.2 g KOH + 2.0 g \(H_2\)

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In this question, we are asked to give reason for why the first ionization energy of the transition elements from Scandium to Zinc fairly constant until Zinc.

As we move along a period, addition of electron takes place in a same shell and due to this addition of electrons in the same d-subshell, the electron suffers repulsion that causes their ionic radii does not decrease much on moving from left to right. Hence, ionization energy of transition elements of 3d series remains almost constant.

The ionization energy is a measure of the ability of an element to enter into chemical reactions by ion formation in other words, by donation of electrons.

Easier the removal of electron from atom, lower will be the Ionisation energy.

More difficult the removal of electron, higher will be the Ionisation energy.

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The % composition of a substance can be used to calculate empirical formulas. The molar mass of the chemical must also be known in order to determine its molecular formula.

What is empirical formula explain?

A compound's various atoms are arranged in an empirical formula in the simplest whole-number ratio.

                               The exact amount of various atom types that make up a compound's molecule are displayed in the molecular formula. The empirical formula for acetylene is CH. Example: C2H2 is the empirical formula for acetylene.

An illustration of an empirical formula?

Its chemical name is C6H12O6, and it is a simple sugar. Every mole of carbon and oxygen is accompanied by two moles of hydrogen. Glucose's empirical formula is  CH2O.

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